import { writeFileSync } from "node:fs";

const cdpPort = process.env.CDP_PORT ?? "9226";
const baseUrl = process.env.SITE_URL ?? "http://127.0.0.1:4325";
const pages = await fetch(`http://127.0.0.1:${cdpPort}/json/list`).then((response) => response.json());
const page = pages.find((entry) => entry.type === "page");
if (!page) throw new Error(`CDP ${cdpPort} 没有可用页面`);

const socket = new WebSocket(page.webSocketDebuggerUrl);
await new Promise((resolve, reject) => {
  socket.addEventListener("open", resolve, { once: true });
  socket.addEventListener("error", reject, { once: true });
});

let nextId = 0;
const pending = new Map();
const exceptions = [];
socket.addEventListener("message", (event) => {
  const message = JSON.parse(event.data);
  if (message.id && pending.has(message.id)) {
    const { resolve, reject } = pending.get(message.id);
    pending.delete(message.id);
    if (message.error) reject(new Error(message.error.message));
    else resolve(message.result);
  }
  if (message.method === "Runtime.exceptionThrown") {
    exceptions.push(message.params.exceptionDetails.exception?.description ?? message.params.exceptionDetails.text);
  }
});

const command = (method, params = {}) => new Promise((resolve, reject) => {
  const id = ++nextId;
  pending.set(id, { resolve, reject });
  socket.send(JSON.stringify({ id, method, params }));
});
const pause = (milliseconds) => new Promise((resolve) => setTimeout(resolve, milliseconds));
const evaluate = async (expression) => {
  const result = await command("Runtime.evaluate", { expression, returnByValue: true, awaitPromise: true });
  if (result.exceptionDetails) throw new Error(result.exceptionDetails.exception?.description ?? result.exceptionDetails.text);
  return result.result.value;
};
const navigate = async (path) => {
  await command("Page.navigate", { url: `${baseUrl}${path}` });
  for (let attempt = 0; attempt < 50; attempt += 1) {
    await pause(100);
    if (await evaluate("document.readyState === 'complete'")) return;
  }
  throw new Error(`${path} 加载超时`);
};
const screenshot = async (path) => {
  const result = await command("Page.captureScreenshot", { format: "png", captureBeyondViewport: false });
  writeFileSync(path, Buffer.from(result.data, "base64"));
};

await command("Page.enable");
await command("Runtime.enable");
await command("Emulation.setDeviceMetricsOverride", {
  width: 1440,
  height: 1100,
  deviceScaleFactor: 1,
  mobile: false,
});
await navigate("/pretraining/data/");
await screenshot("/tmp/llm-atlas-data-desktop.png");

const pipeline = await evaluate(`(() => {
  const root = document.querySelector("[data-data-lab]");
  const measure = () => ({
    trainable: root.querySelector('[data-pipeline-metric="trainable"]').textContent,
    retention: root.querySelector('[data-pipeline-metric="retention"]').textContent,
    quarantine: root.querySelector('[data-pipeline-metric="quarantine"]').textContent,
    rows: root.querySelectorAll(".funnel-row").length,
    tail: root.querySelector('[data-pipeline-slice-label="tail"]').textContent,
  });
  const balanced = measure();
  root.querySelector('[data-pipeline-preset="strict"]').click();
  return { balanced, strict: measure() };
})()`);

const dedup = await evaluate(`(() => {
  const root = document.querySelector("[data-data-lab]");
  root.querySelector('[data-data-tab="dedup"]').click();
  const measure = () => ({
    precision: root.querySelector('[data-dedup-metric="precision"]').textContent,
    recall: root.querySelector('[data-dedup-metric="recall"]').textContent,
    falsePositive: root.querySelector('[data-dedup-metric="false"]').textContent,
    rare: root.querySelector('[data-dedup-metric="rare"]').textContent,
    rows: root.querySelectorAll("[data-dedup-example]").length,
  });
  root.querySelector('[data-dedup-mode="exact"]').click();
  const exact = measure();
  root.querySelector('[data-dedup-mode="semantic"]').click();
  const threshold = root.querySelector('[data-dedup-input="threshold"]');
  threshold.value = "85";
  threshold.dispatchEvent(new Event("input", { bubbles: true }));
  return { exact, semantic: measure() };
})()`);

const mixture = await evaluate(`(() => {
  const root = document.querySelector("[data-data-lab]");
  root.querySelector('[data-data-tab="mixture"]').click();
  const measure = () => ({
    weights: [...root.querySelectorAll("[data-mixture-output]")].slice(0, 5).map((item) => item.textContent),
    epochs: [...root.querySelectorAll("[data-mixture-ledger] small")].map((item) => item.textContent),
    scores: [...root.querySelectorAll("[data-mixture-slices] strong")].map((item) => item.textContent),
    rows: root.querySelectorAll("[data-mixture-ledger] > div").length,
  });
  root.querySelector('[data-mixture-preset="balanced"]').click();
  const balanced = measure();
  root.querySelector('[data-mixture-preset="math"]').click();
  return { balanced, math: measure() };
})()`);

const transform = await evaluate(`(() => {
  const root = document.querySelector("[data-data-lab]");
  root.querySelector('[data-data-tab="transform"]').click();
  const measure = () => ({
    variants: root.querySelector('[data-transform-metric="variants"]').textContent,
    errors: root.querySelector('[data-transform-metric="errors"]').textContent,
    cost: root.querySelector('[data-transform-metric="cost"]').textContent,
    context: root.querySelector('[data-transform-metric="context"]').textContent,
    stages: root.querySelectorAll("[data-transform-timeline] > div").length,
    errorDots: root.querySelectorAll('[data-transform-facts] > i[data-kind="error"]').length,
  });
  root.querySelector('[data-transform-preset="production"]').click();
  const production = measure();
  root.querySelector('[data-transform-preset="risky"]').click();
  const risky = measure();
  const firstTab = root.querySelector('[data-data-tab="pipeline"]');
  firstTab.focus();
  firstTab.dispatchEvent(new KeyboardEvent("keydown", { key: "End", bubbles: true }));
  return {
    production,
    risky,
    keyboard: {
      selected: root.querySelector('[data-data-tab][aria-selected="true"]').dataset.dataTab,
      visible: root.querySelector("[data-data-view]:not([hidden])").dataset.dataView,
    },
  };
})()`);

const layout = await evaluate(`(() => {
  const nav = document.querySelector(".top-nav");
  const meta = document.querySelector(".header-meta");
  return {
    documentOverflow: document.documentElement.scrollWidth - document.documentElement.clientWidth,
    navGap: Number((meta.getBoundingClientRect().left - nav.getBoundingClientRect().right).toFixed(1)),
    navLinks: document.querySelectorAll(".top-nav a").length,
    articleSections: document.querySelectorAll(".article-section").length,
    paperLinks: document.querySelectorAll(".paper-chain a").length,
    labTabs: document.querySelectorAll("[data-data-tab]").length,
    views: document.querySelectorAll("[data-data-view]").length,
  };
})()`);

await evaluate(`(() => {
  document.documentElement.style.scrollBehavior = "auto";
  document.querySelector("[data-data-lab]").scrollIntoView({ block: "start", behavior: "instant" });
})()`);
await pause(150);
await screenshot("/tmp/llm-atlas-data-lab-desktop.png");

await command("Emulation.setDeviceMetricsOverride", {
  width: 390,
  height: 844,
  deviceScaleFactor: 1,
  mobile: true,
});
await navigate("/pretraining/data/");
await evaluate(`document.querySelector("[data-data-lab]").scrollIntoView({ block: "start", behavior: "instant" })`);
await pause(120);
await screenshot("/tmp/llm-atlas-data-lab-mobile.png");
const mobile = await evaluate(`(() => {
  const toggle = document.querySelector("#menu-toggle");
  toggle.click();
  return {
    documentOverflow: document.documentElement.scrollWidth - document.documentElement.clientWidth,
    menuVisible: getComputedStyle(toggle).display !== "none",
    menuOpen: toggle.getAttribute("aria-expanded"),
    mobileLinks: document.querySelectorAll("#mobile-nav a").length,
    selectedTab: document.querySelector('[data-data-tab][aria-selected="true"]').dataset.dataTab,
  };
})()`);

await command("Emulation.setDeviceMetricsOverride", {
  width: 1440,
  height: 1100,
  deviceScaleFactor: 1,
  mobile: false,
});
await navigate("/");
const home = await evaluate(`({
  documentOverflow: document.documentElement.scrollWidth - document.documentElement.clientWidth,
  releaseCards: document.querySelectorAll(".release-card").length,
  firstRelease: document.querySelector(".release-card h2").textContent,
  firstHref: document.querySelector(".release-card").getAttribute("href"),
  paperCount: document.querySelector(".hero-stats div:nth-child(3) b").textContent,
  navLinks: document.querySelectorAll(".top-nav a").length,
})`);

await navigate("/papers/");
const papers = await evaluate(`(() => {
  const button = [...document.querySelectorAll("[data-filter]")].find((item) => item.dataset.filter === "数据");
  button?.click();
  return {
    hasDataFilter: Boolean(button),
    visible: [...document.querySelectorAll("[data-paper]")].filter((item) => !item.hidden).length,
    total: document.querySelectorAll("[data-paper]").length,
  };
})()`);

const report = { pipeline, dedup, mixture, transform, layout, mobile, home, papers, exceptions };
console.log(JSON.stringify(report, null, 2));

const numeric = (value) => Number.parseFloat(value);
const failures = [];
if (pipeline.balanced.rows !== 5 || pipeline.strict.rows !== 5) failures.push("Pipeline 漏斗阶段数量异常");
if (numeric(pipeline.strict.retention) >= numeric(pipeline.balanced.retention)) failures.push("激进过滤没有降低文档保留率");
if (dedup.exact.rows !== 6 || dedup.semantic.rows !== 6) failures.push("去重教学样本数量异常");
if (numeric(dedup.semantic.recall) <= numeric(dedup.exact.recall) || Number(dedup.semantic.falsePositive) < 1) {
  failures.push("Semantic 去重没有体现召回—误伤权衡");
}
if (mixture.balanced.rows !== 5 || mixture.math.rows !== 5) failures.push("Mixture 五领域账本没有完整渲染");
if (numeric(mixture.math.scores[2]) <= numeric(mixture.balanced.scores[2])) failures.push("数学强化没有提升教学 Math slice");
if (numeric(transform.risky.errors) <= numeric(transform.production.errors) || transform.risky.errorDots <= transform.production.errorDots) {
  failures.push("失控合成没有增加错误副本");
}
if (transform.production.stages !== 4 || transform.risky.stages !== 4) failures.push("公开课程阶段数量异常");
if (transform.keyboard.selected !== "transform" || transform.keyboard.visible !== "transform") failures.push("实验页签键盘导航异常");
if (layout.articleSections !== 18 || layout.paperLinks !== 31 || layout.labTabs !== 4 || layout.views !== 4) {
  failures.push("章节、论文或实验数量异常");
}
if (layout.navLinks !== 15 || mobile.mobileLinks !== 15 || home.navLinks !== 15) failures.push("全站导航未同步数值专题");
if (layout.documentOverflow > 0 || mobile.documentOverflow > 0 || home.documentOverflow > 0) failures.push("页面存在横向溢出");
if (layout.navGap < 0) failures.push(`桌面导航碰撞：${layout.navGap}px`);
if (!mobile.menuVisible || mobile.menuOpen !== "true") failures.push("移动端菜单不可用");
if (home.releaseCards !== 10 || !home.firstRelease.includes("DPO 没有") || home.firstHref !== "/post-training/alignment/") {
  failures.push("首页 Transformer 新章入口异常");
}
if (home.paperCount !== "280") failures.push(`首页论文总数异常：${home.paperCount}`);
if (!papers.hasDataFilter || papers.total !== 280 || papers.visible < 25) failures.push("论文库数据标签或论文总数异常");
if (exceptions.length) failures.push(`浏览器脚本异常：${exceptions.join("; ")}`);

socket.close();
if (failures.length) {
  failures.forEach((failure) => console.error(`- ${failure}`));
  process.exit(1);
}
console.log("数据工程专题真实 Chrome 断言通过。");